Light-emitting Module with Offset Optical Axis for Thin Backlight Design
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Solution Overview
Problem
Existing light-emitting modules with direct-lit backlights face challenges in reducing thickness while maintaining effective light distribution, leading to decreased production yield and increased costs due to the need for precise alignment and positioning of light-emitting elements.
Innovation Solution
A light-emitting module design featuring a lightguide plate with recesses and light-transmitting members that allow for partial adjustment of light distribution by offsetting the optical axis of light sources within unit regions, enabling flexible array configurations and reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If light-emitting elements are bonded directly to the lightguide plate to reduce thickness, then the module thickness is reduced, but the light distribution control capability deteriorates
Solution Approach 1:
The lightguide plate is divided into multiple unit regions, each containing a recess with a light-transmitting member. This segmentation allows independent light distribution control in different regions while maintaining overall thinness, resolving the contradiction between reduced thickness and light distribution control capability.
Solution Approach 2:
Different unit regions can have different light-transmitting member configurations (offset distances, receding part depths) to achieve locally optimized light distribution characteristics. This local quality approach enables adaptable light distribution control in specific areas without compromising the overall thin module design.
2Manufacturing precision
If precise alignment and positioning of light-emitting elements are required, then light distribution uniformity improves, but manufacturing complexity and costs increase
Solution Approach 1:
The light-transmitting members are pre-installed in the recesses of the lightguide plate before bonding the light-emitting elements. This preliminary action establishes fixed reference positions that guide the subsequent bonding process, reducing alignment complexity while ensuring uniform light distribution.
Solution Approach 2:
The light-transmitting members act as intermediary elements between the lightguide plate and the light-emitting elements. They provide a standardized interface that simplifies positioning and alignment, reducing manufacturing complexity while maintaining light distribution uniformity.
3Stability of the object's composition
If light sources are centered in each unit region, then light distribution symmetry is improved, but adaptability to different display configurations is reduced
Solution Approach 1:
The offset distance of the light-transmitting member from the recess center can be dynamically adjusted based on the specific display configuration requirements. This dynamic design allows the same lightguide plate structure to adapt to different display sizes and configurations while maintaining appropriate light distribution symmetry for each application.
Solution Approach 2:
By changing the offset parameter of the light-transmitting member position, the light distribution characteristics can be optimized for different display configurations. This parameter adjustment enables versatility across various applications while preserving the necessary symmetry for each specific use case.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances light distribution control, increases production yield, and reduces costs by allowing for adaptable configurations suitable for various display sizes and applications.
Implementation Method 1
a light-transmitting member provided in the first recess in each of the plurality of unit regions, the light-transmitting member covering at least part of a lateral surface of the light source
Data Source
AI summary
A light-emitting module includes: a lightguide plate having a main surface and including a plurality of unit regions including at least one first unit region and a plurality of second unit regions, the lightguide plate including a plurality of first recesses in the main surface; a plurality of light sources provided at the main surface, each of the light sources being located in the first recess so as to correspond to one of the unit regions; and a light-transmitting member provided in the first recess of each of the unit regions. In the second unit regions, an optical axis of the light sources is coincident with a center of the first recess. In the first unit region, the optical axis of the light source is offset from the center of the first recess, and an upper surface of the light-transmitting member has a first receding part.